Local privilege escalation via hidden approved listener

Privilege escalation in Google Android 11 through 13 allows local users to conceal an approved notification listener without user interaction. NotificationAccessSettings.updateList filtered any service whose flattened component name exceeded 500 characters before checking whether notification access was already granted, so approved listeners vanished from Settings. A local app with an overlength listener component name can retain notification access while preventing the device owner from seeing or revoking it through the list.